Malicious PDF — malware analysis report

Static analysis result for SHA-256 608b26b2c380b5dc…

MALICIOUS

PDF

83.0 KB Created: 2021-10-13 02:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 760dfff920b339b07dcf8308688a1292 SHA-1: 1fb8c7e697161a2ae5b0d92a77fba3172c90a5a6 SHA-256: 608b26b2c380b5dcda367c5391a612cbbc5ecda8dfe60546dbc55ce17673b827
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious websites, possibly for SEO poisoning or to serve further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://metapolar.hu/tmp/18473579545.pdf In PDF document text
    • http://haai.org/upload/file/sopitozowunolikuzedel.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614750a4a5cb4---zigowebafat.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b901d5f658---71740356948.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/56748200539.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/tunogovadaxipefid.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134063c7f209---pukusebumupup.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/17229228159.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamisudumulom.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/nenetopinit.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/fosiruvafugapap.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nuxixebijo.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/79163817845.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1615346b8119ea---kutowumavavora.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/10230764133.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/pivodulidalakukuzuxisofi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12d5c6bcb---10825169385.pdfIn PDF document text
    • http://irths.com/upload_files/files/bimejo.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/82941439646.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/7434555483.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/vivifodufig.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/30358224330.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/mifaw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=what+property+of+ocean+water+affects+climate+the+mostPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 17748 bytes
SHA-256: ed39a009f2d9ae1be2e99be5dab3cbe462dfa58cbd4429ca33c4724ca7f0bf42
font_01_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10936 bytes
SHA-256: 757e268f9555f6144984b1e7ab3abb4d379b6c18e5fe9b8a6b83d7d7c7625fc8
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1